Electron gun for cathode-ray tubes



ELECTRON GUN FOR CATHODE RAY TUBES Filed June 14, 1945 2 Sheets-Sheet 1 INVENTORS H O'l new: 8ND 55000! VOLLET *"m Jana ATTORNEY Feb. 17, 1948. oq ETAL I 2,436,264

ELECTRON GUN FOR CATHODE RAY TUBES FiIed AJune 14, 1945 2 Sheets-Sheet 2 INVENTORS RUDOLPH O'LARrE mm Gsonae VOLLET BY v ATTORNEY Patented Feb. 17, 1948 PATENT OFFICE meager ELECTRON GUN or: CATHODE-RAY TUBES Rudolph OLarte, Rego Park. and George Volht, Freeport. N. Y., assignors to Jacques Kreisler Manufacturing Corporation.

North Bergen,

N. J., a corporation ofNew Jersey Application June 14.

Claims. I

This invention relates to electronic devices and more particularly to electron guns for cathode ray tubes.

The-primary object of the present-invention is to provide an improved method of and means for securing various parts of the electron gun to the insulation rods. Heretofore metal disks forming parts of the electron gun were provided with eyelets through which the insulation rods extended,,and the securement of the disks to the rods was effected either by compressing the eyelets against the rods or by the use of ceramic cement. When the securement was accomplished in the first mentionedmanner. namely, by compression of the eyelets, breaking of the insulation rods frequently occurred and other difliculties were encountered. On the other hand, when the disks were secured to the rods by cement the structure lacked a proper degree of sturdiness and moreover the cementing operation itself was in general undesirable and troublesome. The objections and disadvantages of the previous methods of fastening the disks to the insulation rods are eliminated by the present invention.- More specifically, in accordance with the present invention it is unnecessary either to resort to the use of cement or to the operation of compressing eyelets for fastening the disks to theinsulation rods.

The above and other objects, features and advantages of the present invention will be fully understood from the following description considered in connection with the accompanying illustrative drawings.

In the drawings:

Fig. 1 is a side view of part of an electron gun, with the insulation rods shown in section, said view being taken on the line ll of Fig. 6;

Fig. 2 .is a sectional viewon the line 22 of Fig. 1;

Fig. 3 is a perspective view of one of the members utilized in accordance with the present inventlonfor fastening the disks to the insulationv the disk illustrated in Fig. 5 is formed.

Referring now to the drawings in detail, the electron gun 10, illustrated in Fig. 6, comprises the grid l2, the accelerator M, the first anode IS, the second anode 18, the usual sets and 22 of deflecting plates, a disk 24, and the cylin- 1945, Serial No. 599,330

2 drical nsula ion rods-2S; to-whch allot"- said parts are secured. Also. as here shown. the end disk 28 of the first a ode i6 is secured to sa dinsulaticn rods The acce e ator di k i i. the anode ..5 disks l3 and 2S. and the disk 2:: are formedof sheet me al. Th present invention providesv improved m ans for securin the aforementioned disks-to said insulation rods.

It will be noted that the insulation-rods 2S..ex.- tend through the disks and are disposed inwardly of the periph ral edges of the companion disks l4. l8 and 24. and that in the case ofv disk- 28, said insulation rods are fastened thereto at its peripheral edge. p

Referring now to Figs. 1 to 3 of the drawings, the disk 18 comprises a p uralityof collar parts 39, here shown as half-collars. disposed in circumferentiall spaced relation for engagement with the companion circumferentially spaced lnsulation rods 26 respectively. Each collar part 3.!) comprises a semi-cylindrical rod engaging portion 32 and a pair of outturned flanges 34. Collar parts 30 are formed integrally with disk l8 by striking up and drawing operations. openings 25 36 being formed in the disk incidentalto the said operations for formingsaid collar parts. Each of said collar parts 3!! projects fromand is positioned transversely to the plane of the disk. A plurality of complementary collar parts 38 (Fig. 3). here shown as half-collars. are provided for said collar parts 30. Each of said complementary collar parts includes a cylindricalrod-engaging portion 40 and outturned flanges 42. As shown, the semi-cylindrical portions 32 and 4B of the 35 companion collar parts 30 and 38 engage the companion insulation rod 26 and the flanges 34 and 42 are secured to each other in face to race relation preferably byspot welding as indicated at 44. It will be understood that the complementary collar parts 38 are secured to the companion collar parts 30 after the disk is mounted on the rods 26 with the latter engaged by the rod engaging semi-cylindrical portions 32 of collar parts 30, respectively. In order toprovidefa tight grip of the companion collar parts 30 and 38 on the companion rods 26, respectively, the rod engaging portion 40 of each complenientarycoh lar part 38 is preferably slightly smaller than a semi-cylinder, although it has the same radius of curvature as the companionrod engagingfpart 30 and of the companion lnsulation rod 28. Accordingly, when the complementary collar part38 is placed in engagement with the companion rod 26 in confronting relation to the companion col- 55 lar part 30 flanges 42 are spaced slightly from 3 the confronting flanges 34 of the companion collar part 30, whereby in order to weld the flanges 42 to the companion flanges 3 it is necessary to press the complementary collar part 38 tightly against the companion rod 25 with the result that at the completion of the welding operation said rod is tightly gripped between the rod engaging portions 32 and 48 of the companion collar parts 35! and 38, respectively. It will be noted that the recesses defined by the semi-cylindrical portion of the half collars 3B face toward the peripheral edge of the disk, thus facilitating the positioning of the half-collars 38 and the securement thereof to the companion half-collars 35. As illustrated in Fig. 6 the accelerator disk l4 and the disk 24', which engages the rods 26 in position between the two sets 29 and 22 of the deflector plates,

are fastened to the insulator rods in the same way as disk [8, namely by the companion collar parts 38 and 38.

In the case of disks l4, H3 and 24 the rods 26 are disposed inwardly of the peripheral edges of the respective disks and the companion collar parts 33 and 38 define cylindrical openings through which said rods extend. In the case of disk 28, however, the rods 26 are disposed at the peripheral edge of the disk and accordingly the collar parts 45 are located at the peripheral edge of said disk. Said collar parts 46 are of the some construction as the collar parts 35 illustrated in Figs. 1 and 2' and like the latter are integral with the disk being formed by striking up and drawing operations to provide each of said collar parts with a semi-cylindrical rod engaging portion 48 and with a pair of outturned flanges 50. The complementary collar parts 52 are of the same construction as the complementary collar parts 38 and like the latter each half-collar 52 is provided with a semi-cylindrical rod engaging portion 54 with a pair of outturned flanges 56 which are spot welded to the companion flanges 50 so that the companion rod 26 is tightly gripped between the companion semicylin'drical portions 48 and 54 of the companion collar partsdfi and 52. In the form of the invention illustrated in Fig. 5 the companion collar parts instead of being intially separate from each other, as illustrated in Figs. 1 and 4 are integral with each other. Thus, as here shown, the collar part 46A and the complementary collar part 52A are in integral relation, one of the flanges 50A of collar part 46A being integral with the confronting flange 56A of the companion collar part 52A. The other fla ges 50' and 56' of the companion collar parts 45A and 52A are initially in nonconnected relation, and it will be understood that after the disk is placed on the insulation rods 26 flanges 50" and 56 are brought into abutting face to face relation and are spot welded to each other so that the companion collar parts 96A and 52A tightly grip the companion insulation rod, As indicated, the integral flanges SQA and 56A are also preferably spot welded to each other in face to face relation after the companion insulation rod is positioned between the rod engaging portions of said companion collar parts.

The construction illustrated in Fig. 5 is preferably formed from the blank illustrated in Fig. '1. As there shown the blank 28A for the disk is provided with a, plurality of tangential extensions 58. Each extension includes a portion to from which the collar part 46A is formed and a portion 62 from which the collar part 52A is formed. In the init al form of the blank extensions 58A are Hat and are disposed in the plane of the disk.

Then the portions 62 are provided with the semicylindrical portions 64. This operation forms the flanges 56A and 56' of the collar part 52A; Then portions in the adjacent marginal edge portion of the disk are bent and drawn to provide the collar part 46A. In Fig. 7 the dotted lines 66 indicate the line of bend between the flanges 56A and 58A of the companion collar parts 46A and 52A.

It will be understood that various changes may be made in the details of construction and in the form and arrangement of the parts of the devices embodying the present invention without departing from the underlying idea or principles thereof within the scope of the appended claims.

Having thus described our invention, what we claim and desire to secure by Letters Patent is:

1. In an electron gun comprising a metal disk and a, plurality of circumferentially spaced cylindrical insulation rods which extend transversely of the plane of the disk, means for fastening said disk to said rods comprising a plurality of semicylindrical colar parts integral with said disk and disposed transversely to the plane thereof, said collar parts being in circumferentiall'y spaced relation on said disk and engaging peripheral surface portions of said rods, respectively, and a plurality of complementary collar parts confronting said first mentioned collar parts, respectively, and engaging peripheral surface portions, respectively, of said rods, said complementary collar parts having portions welded to portions of the companion collar parts, respectively.

2. In an electron gun comprising a metal disk and a plurality of. circumferentially spaced, cy-,

lindrical insulation rods which extend transversely of the plane of the disk. means for fastening said disk to said rods comprising a plurality of semi-cylindrical collar parts integral with said disk and disposed transversely to the plane thereof, said collar parts being in circumferentially spaced relation on said disk and engaging peripheral surface portions of said rods, respectively, each of said semi-cylindrical collar parts having a pair of integral outwardly extending flanges, and a plurality of complementary collar parts confronting said first mentioned collar parts, respectively, and engaging peripheral surface portions, respectively, of said rods, said complementary collar parts having a pair of outwardly extending flanges welded to the flanges of the companion collar parts, respectively,

3. In an electron gun comprising a metal disk and a plurality of circvmferentially spaced cylindrical insulation rods which extend transversely of the plane of the disk means for fastening said disk to said rods comprising a plurality of semicylindrical csllar parts integral with said disk and disposed transversely to the plane, thereof, said collar parts being in circumferentially spaced relation on said disk and engaging peripheral surface portions of said rods, respectively. and a plurality of compementary collar parts confronting said first mentioned collar parts. respectively, and en aging peripheral surface portions, respectively, of said rods, said complementary collar parts having portions welded to portions of the companion collar parts, respectively, said companion collar parts being disposed inwardly of the outer peripheral edge of the disk and defining a cylindrical opening through which a companion insulation rod extends.

e. In an electron gun comprising a metal disk and a plurality of circumferentially spaced cylindrical insulation rods which extend transversely of the plane of the disk, means for fastening said disk to said rods comprising a plurality of semicylindrical collar parts integral with and projecting from the plane of said disk transversely thereof, said collar parts being in circumferentially spaced relation on said disk and engaging peripheral surface portions of said rods, respectively, and a plurality of complementary collar parts confronting said first mentioned collar parts, respectively, and engaging peripheral surface portions, respectively, of said rods, said complementary collar parts having portions welded to portions of the companion collar parts, respectively. said companion collar parts being disposed at the peripheral edge of the disk and defining a cylindrical opening through which a companion insulation rod extends.

5. Means for fastening a metal disk to a cylindrical insulation rod. comprising a collar part integral with said disk and struck up therefrom. said collar part being positioned transversely of the plane of said disk and having a semi-cylindrical rod-engaging portion and a pair of flanges extend ng outwardly from the opposite sides, respectively, of said semi-cylindrical portion, and a complementary collar part having a semicylindrical rod-engaging portion and a pair of flanges extending outwardly therefrom for securement in face to face relation to said first ment oned flanges, respectively.

6. Means for fastening a metal disk to a plurality of circumferentially spaced cylindrical insulation rods, comprising a plurality of collar parts carried by said disk in circumferentially spaced relation, each of said co lar parts being integral with said disk and struck up therefrom, said collar part being positioned transversely of the plane of said disk and having a semicylindrical rod-engaging portion and a pair of flanges extending outwardly from the opposite sides, respectively. of said semi-cylindrical portion. and a p urality of collar parts complementary to said first mentioned collar parts, each of said complementary collar parts having a semicylindrical rod-engaging portion and a pair of flanges extending outwardly therefrom for securement in face to face relation to said first mentioned flanges, respectively, of the companion collar parts.

'7. The method of assembling a disk of an electron gun w th the circumferentially spaced insulation rods thereof. which com rises providing the disk with a plurality of circumferentially spaced integral half-collars having rod-engaging semi-cylindrical portions, positioning the disk with said semi-cylindrical portions of said halfcollar parts in engagement with said rods. respectively, and securing complementary halfcolars to said first mentioned collars. respectively, with the rods gripped between the companion half-collars, respectively.

8. The method of assembling adisk of an electron gun with the circumferentially spaced insulation rods thereof, which comprises providing the disk with a plurality of circumferentially spaced integral half-collars having rod-engaging semi-cylindrical portions, positioning the disk with said semi-cylindrical portions of said halfcollar parts in engagement with said rods, respectively. and securing initially separate complementary half-collars to said first mentioned collars, respectively, with the rods grip ed between the comp nion half-collars. respectively.

9. The method of assembling a disk of an electron gun with the circumferentially spaced insulation rod thereof, which comprises providing the disk with a plurality of circumferentially spaced integral half-collars having rod-engaging semi-cylindrical portions, and with complementary half -collars integral with the companion half-collars and in movable relation thereto, 'respectively, positioning the disk with said semicylindrical portions of said half-collar parts in engagement with said rods, respectively, and securing said complementary half-collars to said first mentioned collars, respectively, with the rods gripped between the companion half-collars, respectively.

10. A disk for an electron gun, said disk comprising a plurality of circumferentially spaced half-collars disposed transversely to the plane of said disk and having semi-cylindrical rod-engaging portions, respectively, each of said half-collars'having a pair of out-turned flanges.

11. A disk for an electron gun, said disk comprising a plurality of circumferentially spaced half-collars disposed transversely to the plane of said disk and having semi-cylindrical rod-engaging portions, respectively, each of said half-collars having a pair of out-turned flanges, and a plurality of complementary half-collars having rod-engaging portions and pairs of out-turned flanges, respectively, one of t e flanges of each of said complementary half-collars being integral with one of the flanges of the companion halfcollars.

12. A disk for an electron gun, said disk comprising a plurality of circumferentially spaced half-collars disposed transversely to the plane of said disk and having semi-cylindrical rod-engaging portions, respectively, each of said halfcollars having a pair of out-turned flanges, said rod-engaging portions of the half-collars defining recesses which face toward the peripheral edge of the disk.

13. In an electron gun comprising a metal disk .and a plurality of circumferentially spaced cylindrical insulation rods which extend transverse- 1y of the plane of the disk, means for fastening said disk to said rods comprising a plurality of semi-cylindrical collar parts integral with said disk and disposed transversely to the plane thereof, said collar parts beingin circumferentially spaced relation on said disk and engaging peripheral surface portions of said rods, respectively, each of said semi-cylindrical collar parts having a, pair of integral outwardly extending flanges, and a plurality of complementary collar parts confronting said first mentioned collar parts, respectively, and engaging peripheral surface portions, respectively, of said rods, said complementary collar parts having a pair of outwardly extending flanges welded to the flanges of the companion collar parts, respectively. said first mentioned semi-cylindrical parts defining recesses which face toward the peripheral edge of the disk and said complementary collar parts having recesses which face toward the center of the disk.

14. In an electron gun comprising a metal disk and a plurality of circumferentially spaced cylindrical insulation rods which extend transverse y of the plane of the disk, means for fastening said disk to said rods comprising a plurality of semicylindrical collar parts integral with said disk and disposed transversely to the lane thereof, said collar parts being in circumferentially spaced relation on said disk and engaging peripheral sur face portions of said rods. respectively, each of said semi-cylindrical collar parts having a pair of integral outwardly extending flanges, and a Pluralityof complementarycollarparts confrontingsa-id-first mentioned collar parts; respective.- ly;vandgengagingvperipheral surface portions, respectiY.ely, ;of,=said rods, said complementary collar;parts-;having; a pair of-outwardly extending;

flangesvwelded toqtheflan ef 0f the companion collar parts, respectively, saidfirst Y mentioned semi cylindrical parts definingrecesses which,

face toward the peripheral edge of the disk and said -;complementarycollar parts having recesses which face toward the center of'the disk, said companion 1 collar; parts beingdisposed inwardly of the peripheral edge of the disk and defining a cylindrical. opening through which a companion insulation rod extends.

15. In an electron gun comprising a metal disk and-1a plurality of circumferentially spaced cylindrical insulation rods which extend transversely of the plane-of the disk, means for-fastening said di k to said rods comprising a nlurality. of semi-cylindrical collar parts integral with said disk and disposed transversely tothe planethereof, said collar parts being in-circumierentiallysfiaced relation on saiddisk and engaging peripheralsurface portions-of said rods, respectively, each of said SBIIlicCYlilldIiCSJ. collar parts having a pair of integral. outwardly extending flanges, and a plurality of complementary,collar-parts confronting saidfirst mentioned collar v parts;v respective? ly; and engagingper-ipheral surface portions. re-

speotively, of said rods, said com; lementary collar parts having a pair-ofoutwardly exiendng flangesvwelded to the flanges of-the companion collar. parts,- respectively, said firstmentioned semi-cylindrical parts defining recesses which face toward the peripheral edge of thedisk and said-complementarycollar parts having recesses whichface toward the center of the disk, said companion collarparts being disposed at the peripheraledge of'the-disk and defining a cylindrical opening through which a, companion insulation rod extends.

- RUDOLPH OLARTEV GEORGE VOLLET.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED; STATES, PATENTS 

